Some of Lovecraft’s friends, Paul Cook; Edith Dowe Miniter; a young James Ferdinand Morton Jr.; George J. Houtain. Mrs Miniter I’ve seen before, although this is perhaps a better scan than some faded ones online. From the book Ex-presidents of the National Amateur Press Association : sketches published by Paul Cook from Athol, 1919. Which also has potted biographies: did you know Cook wrote much fiction, under a pseudonym? That he was a story writer is not a fact not found in the Lovecraft Encyclopedia entry for Cook. Although it seems a limited-edition book of his stories has been collected as Willis T. Crossman’s Vermont: Stories (2005).
And Edward H. Cole of Boston, who Lovecraft visited frequently in the 1920s and 30s.